"G/L account521201 1110 does not exist Message no.F5106 Diagnosis A line Item is to be posted to the non existent G/L account 521201 in company code 1110 system response The invalid account is rejected Procedure If you have entered the account number, correct your entry. If the account number was rejected when the system created automatic postings check which posting it may concern by means of business transaction. Contact the system administrator to correct the account determination for the effected transaction"

You are doing transaction f-22 for entry of customer invoice. The default posting key is 01 for the customer account code. If the error message is the g/l account, maybe the recon account of the customer no longer exists or you have changed the posting key to g/l account posting key

Thanks for the earlier resposes. Now I have got an query, while assigning gl accounts to fixed assets, what are the gl accounts needs to be created to assign the same. I saw in one of the forum, it was mentioned that there are 16 gls to be assigned, kindly let me know those gl accounts for me to create.

Normally you have to create at least 7 G/l accounts to create for fixed
asset.

For example:
Suppose you are creating Land and Building Asset, then you have to Create
the Following G/L:

1) APC G/L - Land and Building A/C ( should be Recon A/C)
2) Accumulated Depreciation for Land & Building A/C ( should be Recon A/C)
3) Ordinary depreciation for Land A/C (should be P/L A/C)
4) Sale of land A/C (should be P/L A/C)
5) Scrap of Asset (should be P/L A/C)
6) Profit on sale of Asset (should be P/L A/C)
7) Loss on sale of Asset (should be P/L A/C)